diff --git a/README.md b/README.md
index f46ced4..b1467a4 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,7 @@ sORG $30000
 $30000:
 $30053:mx
 $31066:e
+$35440:d <myTable>
 ```
 
 The first line specifies the segment file that this map applies to.  The filename in the quotes should be relative to the current directory.
@@ -67,8 +68,15 @@ The next lines are a list of entry points to begin disassembly at.  If, when ana
 
 The flags after the colon are optional, and specify whether emulation mode should be enabled, or 16-bit or 8-bit accumulator and index registers should be used.  It defaults to native mode with 16-bit registers.
 
+After the flags, you may optionally give the address a symbol name.  Whenever
+this memory location is referenced in the code, the symbol name will appear as a
+comment.
+
 You can also use bank-separators if you wish.  `$3/1066` is the same as `$31066`.
 
+The `d` flag is unique in that it identifies the address as a data location and
+not an entry point.  This is used to give variables symbol names.
+
 
 
 ## Pascal folder
@@ -200,7 +208,7 @@ registers.
 
 So we can use all of that information to disassemble this file.
 
-`$ regs --org=2000 -m -x BASIC.SYSTEM > basic.s`
+`$ regs --org=0x2000 -m -x BASIC.SYSTEM > basic.s`
 
 This tells regs to start with 8-bit accumulator and indices, and load the
 file starting at `$2000` before disassembling it.
diff --git a/addresses.h b/addresses.h
index 4b1691e..6824bb2 100644
--- a/addresses.h
+++ b/addresses.h
@@ -399,7 +399,7 @@ static MemAddress addresses[] = {
 
 #define numAddresses (sizeof(addresses) / sizeof(addresses[0]))
 
-static const char *addressLookup(uint32_t addr) {
+static const char *addressLookup(uint32_t addr, Map *map) {
   for (int i = 0; i < numAddresses; i++) {
     if (addresses[i].address >= addr) {
       if (addresses[i].address == addr)
@@ -407,7 +407,12 @@ static const char *addressLookup(uint32_t addr) {
       break;
     }
   }
+  for (Rule *rule = map->rules; rule != NULL; rule = rule->next) {
+    if (rule->address == addr && rule->symbol != NULL) {
+      return rule->symbol;
+    }
+  }
   if (addr & ~0xffff)
-    return addressLookup(addr & 0xffff);  // try pageless
+    return addressLookup(addr & 0xffff, map);  // try pageless
   return NULL;
 }
diff --git a/disasm.c b/disasm.c
index a7badc1..9b49012 100644
--- a/disasm.c
+++ b/disasm.c
@@ -128,8 +128,10 @@ void disassemble(uint8_t *data, size_t len, Map *map) {
             printf("#$%02x", *ptr++);
             oprlen = 4;
           } else {
-            printf("#$%04x", r16(ptr)); ptr += 2;
+            val = r16(ptr); ptr += 2;
+            printf("#$%04x", val);
             oprlen = 6;
+            comments = addressLookup(val, map);
           }
           break;
         case IMMX:
@@ -141,40 +143,50 @@ void disassemble(uint8_t *data, size_t len, Map *map) {
             x = r16(ptr); ptr += 2;
             printf("#$%04x", x);
             oprlen = 6;
+            comments = addressLookup(x, map);
           }
           break;
         case IMMS:
-          printf("#$%04x", r16(ptr)); ptr += 2;
+          val = r16(ptr); ptr += 2;
+          printf("#$%04x", val);
           oprlen = 6;
+          comments = addressLookup(x, map);
           break;
         case ABS:
           val = r16(ptr); ptr += 2;
           printf("$%04x", val);
           oprlen = 5;
-          comments = addressLookup(val);
+          comments = addressLookup(val, map);
           break;
         case ABL:
           val = r24(ptr); ptr += 3;
           printf("$%02x/%04x", val >> 16, val & 0xffff);
           oprlen = 8;
-          comments = addressLookup(val);
+          comments = addressLookup(val, map);
           break;
         case ABX:
-          printf("$%04x, x", r16(ptr)); ptr += 2;
+          val = r16(ptr); ptr += 2;
+          printf("$%04x, x", val);
           oprlen = 8;
+          comments = addressLookup(val, map);
           break;
         case ABY:
-          printf("$%04x, y", r16(ptr)); ptr += 2;
+          val = r16(ptr); ptr += 2;
+          printf("$%04x, y", val);
           oprlen = 8;
+          comments = addressLookup(val, map);
           break;
         case ABLX:
           val = r24(ptr); ptr += 3;
           printf("$%02x/%04x, x", val >> 16, val & 0xffff);
           oprlen = 11;
+          comments = addressLookup(val, map);
           break;
         case AIX:
-          printf("($%04x, x)", r16(ptr)); ptr += 2;
+          val = r16(ptr); ptr += 2;
+          printf("($%04x, x)", val);
           oprlen = 10;
+          comments = addressLookup(val, map);
           break;
         case ZP:
           printf("$%02x", *ptr++);
@@ -193,8 +205,10 @@ void disassemble(uint8_t *data, size_t len, Map *map) {
           oprlen = 6;
           break;
         case IND:
-          printf("($%04x)", r16(ptr)); ptr += 2;
+          val = r16(ptr); ptr += 2;
+          printf("($%04x)", val);
           oprlen = 7;
+          comments = addressLookup(val, map);
           break;
         case INZ:
           printf("($%02x)", *ptr++);
@@ -225,12 +239,14 @@ void disassemble(uint8_t *data, size_t len, Map *map) {
           d6 = delta + addr;
           printf("$%02x/%04x", d6 >> 16, d6 & 0xffff);
           oprlen = 8;
+          comments = addressLookup(d6, map);
           break;
         case RELL:
           delta16 = r16(ptr); ptr += 2;
           d6 = delta16 + addr;
           printf("$%02x/%04x", d6 >> 16, d6 & 0xffff);
           oprlen = 8;
+          comments = addressLookup(d6, map);
           break;
         case BANK:
           val = *ptr++;
diff --git a/map.c b/map.c
index d0289fd..d9999f1 100644
--- a/map.c
+++ b/map.c
@@ -48,7 +48,27 @@ static Rule *parseRule(ConfigFile *f) {
       rule->flags |= IsX8;
       foundFlag = true;
     }
+    if (token(f, 'd')) {
+      rule->flags &= ~IsOpcode;
+      rule->flags |= IsData;
+      foundFlag = true;
+    }
   } while (foundFlag);
+  rule->symbol = NULL;
+  if (token(f, '<')) {
+    uint8_t *fnp = f->p;
+    while (fnp < f->end && *fnp != '>') {
+      fnp++;
+    }
+    if (fnp == f->end) {
+      fail(f, "Symbol has no closing '>'.");
+    }
+    int flen = fnp - f->p;
+    rule->symbol = malloc(flen);
+    memcpy(rule->symbol, f->p, flen);
+    rule->symbol[flen] = 0;
+    f->p = fnp + 1;
+  }
   return rule;
 }
 
diff --git a/map.h b/map.h
index c8841df..9ed9d0d 100644
--- a/map.h
+++ b/map.h
@@ -19,6 +19,7 @@ typedef enum {
 typedef struct Rule {
   uint32_t address;
   uint16_t flags;
+  char *symbol;
   struct Rule *next;
 } Rule;
 
diff --git a/omf.c b/omf.c
index 8667211..d8216ec 100644
--- a/omf.c
+++ b/omf.c
@@ -17,7 +17,7 @@ static char doc[] = "Relocate and extract OMF segments"
 static char args_doc[] = "FILE";
 static struct argp_option options[] = {
   {"org", 'o', "ADDRESS", OPTION_ARG_OPTIONAL,
-    "Start mapping the segments at this address, default 20000"},
+    "Start mapping the segments at this address, default $20000"},
   {"map", 'm', "FILE", OPTION_ARG_OPTIONAL,
     "Use this map to extract the segments"},
   {"prefix", 'p', "PREFIX", OPTION_ARG_OPTIONAL,
@@ -37,16 +37,32 @@ static inline uint32_t parseNum(const char *s) {
   while (isspace(*s)) {
     s++;
   }
-  while (isxdigit(*s)) {
-    res <<= 4;
-    if (*s >= '0' && *s <= '9') {
-      res |= *s - '0';
-    } else if (*s >= 'a' && *s <= 'f') {
-      res |= *s - 'a' + 10;
-    } else if (*s >= 'A' && *s <= 'F') {
-      res |= *s - 'A' + 10;
-    }
+  bool ishex = false;
+  if (s[0] == '0' && s[1] == 'x') {
+    s += 2;
+    ishex = true;
+  } else if (s[0] == '$') {
     s++;
+    ishex = true;
+  }
+  if (ishex) {
+    while (isxdigit(*s)) {
+      res <<= 4;
+      if (*s >= '0' && *s <= '9') {
+        res |= *s - '0';
+      } else if (*s >= 'a' && *s <= 'f') {
+        res |= *s - 'a' + 10;
+      } else if (*s >= 'A' && *s <= 'F') {
+        res |= *s - 'A' + 10;
+      }
+      s++;
+    }
+  } else {
+    while (isdigit(*s)) {
+      res *= 10;
+      res += *s - '0';
+      s++;
+    }
   }
   return res;
 }
diff --git a/regs.c b/regs.c
index 48e8309..469076c 100644
--- a/regs.c
+++ b/regs.c
@@ -4,6 +4,7 @@
  */
 
 #include <argp.h>
+#include <stdbool.h>
 #include "handle.h"
 #include "scan.h"
 #include "disasm.h"
@@ -14,7 +15,7 @@ static char doc[] = "Disassemble Apple IIgs software";
 static char args_doc[] = "FILE or MAP";
 static struct argp_option options[] = {
   {"org", 'o', "ADDRESS", 0,
-    "Starting address of the binary file, in hex"},
+    "Starting address of the binary file"},
   {"m", 'm', 0, OPTION_ARG_OPTIONAL,
     "Start with 8-bit accumulator"},
   {"x", 'x', 0, OPTION_ARG_OPTIONAL,
@@ -35,16 +36,32 @@ static inline uint32_t parseNum(const char *s) {
   while (isspace(*s)) {
     s++;
   }
-  while (isxdigit(*s)) {
-    res <<= 4;
-    if (*s >= '0' && *s <= '9') {
-      res |= *s - '0';
-    } else if (*s >= 'a' && *s <= 'f') {
-      res |= *s - 'a' + 10;
-    } else if (*s >= 'A' && *s <= 'F') {
-      res |= *s - 'A' + 10;
-    }
+  bool ishex = false;
+  if (s[0] == '0' && s[1] == 'x') {
+    s += 2;
+    ishex = true;
+  } else if (s[0] == '$') {
     s++;
+    ishex = true;
+  }
+  if (ishex) {
+    while (isxdigit(*s)) {
+      res <<= 4;
+      if (*s >= '0' && *s <= '9') {
+        res |= *s - '0';
+      } else if (*s >= 'a' && *s <= 'f') {
+        res |= *s - 'a' + 10;
+      } else if (*s >= 'A' && *s <= 'F') {
+        res |= *s - 'A' + 10;
+      }
+      s++;
+    }
+  } else {
+    while (isdigit(*s)) {
+      res *= 10;
+      res += *s - '0';
+      s++;
+    }
   }
   return res;
 }
diff --git a/scan.c b/scan.c
index 77c44eb..a039295 100644
--- a/scan.c
+++ b/scan.c
@@ -52,7 +52,9 @@ void scan(uint8_t *data, size_t len, Map *map) {
   map->mem = calloc(len, sizeof(MapFlags));
 
   for (Rule *rule = map->rules; rule != NULL; rule = rule->next) {
-    appendList(&toScan, rule->address, rule->flags);
+    if (rule->flags & IsOpcode) {
+      appendList(&toScan, rule->address, rule->flags);
+    }
   }
 
   while (toScan.num > 0) {