3 files changed, 15 insertions, 2 deletions
diff --git a/hcalc.1 b/hcalc.1
index c7eddc9..e6ea5ea 100644
--- a/hcalc.1
+++ b/hcalc.1
@@ -159,9 +159,15 @@ once in \-2.
 \fIDEL\fP key: delete the rightmost digit.
 .TP
 .B \fBC\fP \fBEscape\fP
-\fICLR\fP key: clears the number.
+\fICLR\fP key: clears the number and any pending operation.
+.TP
+.B \fBu\fP
+Clears the number, same as backspacing over it, but does not
+clear any pending operation. There is no button in the UI for
+this, so it can\(aqt be done with the mouse.
 .TP
 .B \fBD\fP \fBH\fP \fBO\fP \fBB\fP
+\fIDEC\fP \fIHEX\fP \fIOCT\fP \fIBIN\fP keys.
 Set the number base to decimal, hex, octal, or binary. The
 number currently displayed is converted into the new base.
 These are capital letters (hold down Shift).
diff --git a/hcalc.h b/hcalc.h
index a469c9a..ce43621 100644
--- a/hcalc.h
+++ b/hcalc.h
@@ -58,5 +58,6 @@ void process_input();
 void load_config(void);
 void save_config(void);
 void show_value();
+void bell(void);
 
 #define MAXCHARS 15
diff --git a/hcalc.rst b/hcalc.rst
index 3bd0bef..4b3fba3 100644
--- a/hcalc.rst
+++ b/hcalc.rst
@@ -147,9 +147,15 @@ KEYBOARD
             *DEL* key: delete the rightmost digit.
 
 **C** **Escape**
-            *CLR* key: clears the number.
+            *CLR* key: clears the number and any pending operation.
+
+**u**
+            Clears the number, same as backspacing over it, but does not
+            clear any pending operation. There is no button in the UI for
+            this, so it can't be done with the mouse.
 
 **D** **H** **O** **B**
+            *DEC* *HEX* *OCT* *BIN* keys.
             Set the number base to decimal, hex, octal, or binary. The
             number currently displayed is converted into the new base.
             These are capital letters (hold down Shift).