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diff --git a/doc/cmd.1 b/doc/cmd.1
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+.SS Keyboard commands
+.
+.TP
+.B Shift-q
+Quit.
+.
+.TP
+.B [0..9]
+Enter a digit into the input buffer.
+pfc works with floating point numbers so the
+.B .
+character is OK as well.
+.
+.TP
+.B Backspace
+Remove a digit from the input buffer.
+.
+.TP
+.B Enter
+Push the number in the input buffer to the stack.
+.
+.TP
+.B Shift-j
+Swap the bottom (most recently pushed) item on the stack with the input buffer.
+If the input buffer is empty this simply moves the most recently pushed item
+back into the input buffer.
+.
+.TP
+.B Shift-k
+The same as
+.BR Shift-j .
+.
+.TP
+.B Shift-d
+Delete the contents of the input buffer.
+.
+.TP
+.B Shift-c
+Delete the contents of the input buffer and the stack.
+.
+.TP
+.B Shift-a
+Toggle between degree and radian mode.
+.
+.TP
+.B Shift-n
+Negation. If there is a number in the buffer, negate it. Otherwise, negate the
+bottom number in the stack.
diff --git a/doc/const.1 b/doc/const.1
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+.SS Constants
+.
+.TP
+.B pi
+Archimedes’ constant (π).
+.
+.TP
+.B e
+Euler’s number (e).
diff --git a/doc/func.1 b/doc/func.1
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+.SS Functions
+.
+.TP
+.B sin
+Sine function.
+.
+.TP
+.B cos
+Cosine function.
+.
+.TP
+.B tan
+Tangent function.
+.
+.TP
+.B asin
+Inverse sine function.
+.
+.TP
+.B acos
+Inverse cosine function.
+.
+.TP
+.B atan
+Inverse tangent function.
+.
+.TP
+.B deg
+Convert radians to degrees.
+.
+.TP
+.B rad
+Convert degrees to radians.
diff --git a/doc/intro.1 b/doc/intro.1
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+.TH PFC 1 pfc\-VERSION
+.SH NAME
+pfc \- postfix calculator
+.SH SYNOPSIS
+.B pfc
+.SH DESCRIPTION
+pfc is an interactive postfix, or reverse Polish notation, calculator.
+.SH USAGE
diff --git a/doc/op.1 b/doc/op.1
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+.SS Operators
+.
+.TP
+.B +
+Addition.
+.
+.TP
+.B -
+Subtraction.
+.
+.TP
+.B *
+Multiplication.
+.
+.TP
+.B /
+Division.
+.
+.TP
+.B %
+Modulo/remainder.
+.
+.TP
+.B ^
+Exponentiation.