diff --git a/pdp8_isa_ildec.md b/pdp8_isa_ildec.md
index 8b4dec5..9e7f7cf 100644
--- a/pdp8_isa_ildec.md
+++ b/pdp8_isa_ildec.md
@@ -12,7 +12,7 @@ The emulator models a simplified 12-bit DEC PDP-8/L processor. CPU registers and
 *   **`pc` (Program Counter)**: 12-bit register holding the address offset of the next instruction.
 *   **`ac` (Accumulator)**: 12-bit register used for arithmetic, logic, and I/O.
 *   **`link` (Link Register)**: 1-bit register functioning as a carry/overflow indicator, logically positioned to the left of the Accumulator for shifts.
-*   **sr` (Switch Register)**: 12-bit register representing front panel switches, queried via operate instructions.
+*   **`sr` (Switch Register)**: 12-bit register representing front panel switches, queried via operate instructions.
 *   **Program Interrupt Registers**:
     *   `ie` (Interrupt Enable Flag): 1-bit register controlling the interrupt system.
     *   `ion_delay` (Interrupt On Delay): Counter managing the 1-instruction latency for enabling interrupts.