diff --git a/src/main.c b/src/main.c
index 2acc375..a2cf6e3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -15,6 +15,14 @@
  * \section install Installation
  *
  * How to install Scyther.
+ *
+ * \section coding Coding convertions
+ *
+ * Usually, each source file except main.c has an myfileInit() and myfileDone() function
+ * available. These allow any initialisation and destruction of required structures.
+ *
+ * GNU indent rules are used, but K&R derivatives are allowed as well. Conversion can
+ * be done for any style using the GNU indent program.
  */
 
 #include <stdlib.h>
diff --git a/src/symbols.c b/src/symbols.c
index 6efae1c..eacabc3 100644
--- a/src/symbols.c
+++ b/src/symbols.c
@@ -16,12 +16,16 @@ extern int yylineno;
 
 /* global declarations */
 
+//! Symbol hash table.
 Symbol symbtab[HASHSIZE];
+//! List of available (freed) symbol blocks.
 Symbol symb_list;
+//! List of all allocated symbol blocks.
 Symbol symb_alloc;
 
 /* main code */
 
+//! Open symbols code.
 void
 symbolsInit (void)
 {
@@ -33,6 +37,7 @@ symbolsInit (void)
   symb_alloc = NULL;
 }
 
+//! Close symbols code.
 void
 symbolsDone (void)
 {
@@ -46,6 +51,11 @@ symbolsDone (void)
     }
 }
 
+//! Create a memory block for a symbol.
+/**
+ * Internal memory management is used.
+ *@return A pointer to a memory block of size struct.
+ */
 Symbol
 get_symb (void)
 {
@@ -64,6 +74,7 @@ get_symb (void)
   return t;
 }
 
+//! Declare a symbol to be freed.
 void
 free_symb (Symbol s)
 {
@@ -73,6 +84,7 @@ free_symb (Symbol s)
   symb_list = s;
 }
 
+//! Return the index in the hash table for the string.
 int
 hash (char *s)
 {
@@ -88,6 +100,7 @@ hash (char *s)
   return hv % HASHSIZE;
 }
 
+//! Insert a string into the hash table.
 void
 insert (Symbol s)
 {
@@ -99,6 +112,7 @@ insert (Symbol s)
   symbtab[hv] = s;
 }
 
+//! Find a string in the hash table.
 Symbol
 lookup (char *s)
 {
@@ -118,6 +132,7 @@ lookup (char *s)
   return t;
 }
 
+//! Print a symbol.
 void
 symbolPrint (Symbol s)
 {
@@ -128,6 +143,11 @@ symbolPrint (Symbol s)
   printf ("%s", s->text);
 }
 
+//! Insert a string into the symbol table, if it wasn't there yet.
+/**
+ * Also sets line numbers and type.
+ *\sa T_SYSCONST
+ */
 Symbol
 symbolSysConst (char *str)
 {
diff --git a/src/symbols.h b/src/symbols.h
index ef6b6d7..2edf306 100644
--- a/src/symbols.h
+++ b/src/symbols.h
@@ -1,7 +1,9 @@
 #ifndef SYMBOLS
 #define SYMBOLS
 
-/* Size of hashtable: optimistically large. */
+//! Size of symbol hashtable.
+/** Optimistically large. Should be a prime, says theory.
+ */
 #define HASHSIZE 997
 
 #define T_UNDEF		-1
@@ -14,10 +16,18 @@
 
 struct symbol
 {
+  //! Type of symbol.
+  /**
+   *\sa T_UNDEF, T_PROTOCOL, T_CONST, T_VAR, T_SYSCONST
+   */
   int type;
+  //! Line number at which it occurred.
   int lineno;
+  //! Ascii string with name of the symbol.
   char *text;
+  //! Possible next pointer.
   struct symbol *next;
+  //! Used for linking all symbol blocks, freed or in use.
   struct symbol *allocnext;
 };