diff --git a/backlog/001_Elementary Stochastic Caculus/README.md b/backlog/010_Elementary Stochastic Caculus/README.md similarity index 100% rename from backlog/001_Elementary Stochastic Caculus/README.md rename to backlog/010_Elementary Stochastic Caculus/README.md diff --git a/backlog/001_Elementary Stochastic Caculus/book.pdf b/backlog/010_Elementary Stochastic Caculus/book.pdf similarity index 100% rename from backlog/001_Elementary Stochastic Caculus/book.pdf rename to backlog/010_Elementary Stochastic Caculus/book.pdf diff --git a/backlog/002_A guide to Brownian motion and related stochastic processes/README.md b/backlog/020_A guide to Brownian motion and related stochastic processes/README.md similarity index 100% rename from backlog/002_A guide to Brownian motion and related stochastic processes/README.md rename to backlog/020_A guide to Brownian motion and related stochastic processes/README.md diff --git a/backlog/002_A guide to Brownian motion and related stochastic processes/book.pdf b/backlog/020_A guide to Brownian motion and related stochastic processes/book.pdf similarity index 100% rename from backlog/002_A guide to Brownian motion and related stochastic processes/book.pdf rename to backlog/020_A guide to Brownian motion and related stochastic processes/book.pdf diff --git a/backlog/003_Stochastic Calculus: An Introduction with Applications/Stochastic Calculus: An Introduction with Applications.pdf b/backlog/030_Stochastic Calculus: An Introduction with Applications/Stochastic Calculus: An Introduction with Applications.pdf similarity index 100% rename from backlog/003_Stochastic Calculus: An Introduction with Applications/Stochastic Calculus: An Introduction with Applications.pdf rename to backlog/030_Stochastic Calculus: An Introduction with Applications/Stochastic Calculus: An Introduction with Applications.pdf diff --git a/reading/011_Algorithmic Trading Winning Strategies and their rationale/Algorithmic Trading Winning Strategies and their rationale.pdf b/reading/001_Algorithmic Trading Winning Strategies and their rationale/Algorithmic Trading Winning Strategies and their rationale.pdf similarity index 100% rename from reading/011_Algorithmic Trading Winning Strategies and their rationale/Algorithmic Trading Winning Strategies and their rationale.pdf rename to reading/001_Algorithmic Trading Winning Strategies and their rationale/Algorithmic Trading Winning Strategies and their rationale.pdf diff --git a/reading/011_Algorithmic Trading Winning Strategies and their rationale/README.md b/reading/001_Algorithmic Trading Winning Strategies and their rationale/README.md similarity index 100% rename from reading/011_Algorithmic Trading Winning Strategies and their rationale/README.md rename to reading/001_Algorithmic Trading Winning Strategies and their rationale/README.md