diff --git a/c.texi b/c.texi
index 27026c2..8a422f8 100644
--- a/c.texi
+++ b/c.texi
@@ -2361,19 +2361,28 @@ example, given a date specified by day of the month @code{d}, month
 integer @code{date}:
 
 @example
-unsigned int d = 12;
-unsigned int m = 6;
-unsigned int y = 1983;
+unsigned int d = 12;		/* @r{12 in binary is 0b1100.}  */
+unsigned int m = 6;             /* @r{6 in binary is 0b110.}  */
+unsigned int y = 1983;          /* @r{1983 in binary is 0b11110111111.}  */
 unsigned int date = (((y << 4) + m) << 5) + d;
+                                /* @r{Add 0b11110111111000000000}
+                                   @r{and 0b11000000 and 0b1100.}
+                                   @r{Sum is 0b11110111111011001100.}  */
 @end example
 
 @noindent
-To extract the original day, month, and year out of
-@code{date}, use a combination of shift and remainder.
+To extract the day, month, and year out of
+@code{date}, use a combination of shift and remainder:
 
 @example
+/* @r{32 in binary is 0b100000.}  */
+/* @r{Remainder dividing by 32 gives lowest 5 bits, 0b1100.}  */
 d = date % 32;
+/* @r{Shifting 5 bits right discards the day, leaving 0b111101111110110.}
+      Remainder dividing by 16 gives lowest remaining 4 bits, 0b110.}  */
 m = (date >> 5) % 16;
+/* @r{Shifting 9 bits right discards day and month,}
+   @r{leaving 0b111101111110.}  */
 y = date >> 9;
 @end example
 
@@ -7170,7 +7179,7 @@ set_message (char *text)
       if (text[i] == 0)
         return;
     @}
-  fatal_error ("Message is too long for `message');
+  fatal_error ("Message is too long for `message'\n");
 @}
 @end example