- "a vector of vectors which holds a histogram of byte-code usage.");
- DEFVAR_BOOL ("byte-metering-on", &byte_metering_on, "");
+ "A vector of vectors which holds a histogram of byte-code usage.\n\
+(aref (aref byte-code-meter 0) CODE) indicates how many times the byte\n\
+opcode CODE has been executed.\n\
+(aref (aref byte-code-meter CODE1) CODE2), where CODE1 is not 0,\n\
+indicates how many times the byte opcodes CODE1 and CODE2 have been\n\
+executed in succession.");
+ DEFVAR_BOOL ("byte-metering-on", &byte_metering_on,
+ "If non-nil, keep profiling information on byte code usage.\n\
+The variable byte-code-meter indicates how often each byte opcode is used.\n\
+If a symbol has a property named `byte-code-meter' whose value is an\n\
+integer, it is incremented each time that symbol's function is called.");