C.A.N. System Changelog

All notable changes to the Curtiss Annotation Nomenclature (CAN) Guide will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Versioning Policy

The Official Guide to The CAN System of Codes and Emphasizers uses Semantic Versioning. Version changes (generally) follow this framework:

• Major version increase – Any CAN Code or CAN Emphasizer value changes
• Minor version increase – Any explanation is added, edited, or removed, or contact information is updated
• Patch version increase – Spelling or grammar changes

Changes are reviewed as feedback is submitted and updates to the Guide are grouped together to minimize the number of new versions.

Document Verification

Each version includes a SHA-256 checksum for integrity verification that you can use to authenticate it (if you’d like to). To do this, in the Version History section below, click on the version number and download the guide, then open your terminal, navigate to the guide and run the command provided in that version’s section. The output you receive should match the Expected Output for that version.

Version History

Click on any version number to view that guide version

1.1.1 - 2025-12-23 - Current Version

Changed

• Updated the url links in the Contact
• Updated example in Intro
• File name and title updated (previous version had hardcoded version in title)
• Grammar modified

Verifications

Command:

shasum -a 256 Curtiss_Annotation_Nomenclature_Guide_v1_1_1.pdf

Expected Output:

d7289b05fc0e214bae2d37e608e9c15f6254a1dc10dc068107f88795d50b30ce

---

1.1.0 - 2025-12-22

Changed

• Updated the Contact information

Added

• Added to the Usage Guide, a brief explanation of the number’s position and meaning in the standard CAN System annotation

Verifications

Command:

shasum -a 256 Curtiss_Annotation_Nomenclature_Guide_v1_1_0.pdf

Expected Output:

54cc155e3d1cf0c29c95e5137e55b72f198b3ec6d244dacba715cc8d99f96a54

---

1.0.0 - 2025-12-18

Added

• Initial release of the Curtiss Annotation Nomenclature Guide
• PDF documentation (Curtiss_Annotation_Nomenclature_Guide.pdf)
• SHA-256 hash verification for document integrity
• README with download and verification instructions

Verifications

Command:

shasum -a 256 Curtiss_Annotation_Nomenclature_Guide_v1_0_0.pdf

Expected Output:

b8dde3c8f7d45c71b65d68e5a6b5268dbd82d42bc7539db58864b04c21e971b3