diff --git a/docs/stdlib/frequent.md b/docs/stdlib/frequent.md
index e649dbe1..1367939c 100644
--- a/docs/stdlib/frequent.md
+++ b/docs/stdlib/frequent.md
@@ -10,6 +10,9 @@ Prints a single character.
 
 Available for: all computer targets.
 
+Note that this function obeys typical platform idiosyncrasies,
+for example on CBM targets the quote character will toggle the quotation mode.
+
 #### `void new_line()`
 
 Moves the cursor to the next line.
diff --git a/docs/stdlib/stdio.md b/docs/stdlib/stdio.md
index 0442b596..a73dc9d6 100644
--- a/docs/stdlib/stdio.md
+++ b/docs/stdlib/stdio.md
@@ -9,6 +9,9 @@ It requires an implementation of `void putchar(byte a)` and therefore works only
 
 Prints a string of length `len` located at address `str`.  
 
+Note that both this function and `putstrz` obey typical platform idiosyncrasies,
+for example on CBM targets the quote character will toggle the quotation mode. This may be subject to change.
+
 #### `void putstrz(pointer str)`
 
 Prints a null-terminated string located at address `str`.